Jacek Gondzio (University of Edinburgh)

Matrix-free interior point method
Wednesday 7 October 2009 at 15.30, JCMB 6206


A redesign of Interior Point Methods (IPMs) for LP/QP problems will be addressed. Its objective is to avoid an explicit access to the problem data and to allow only matrix-vector products to be executed with the Hessian and Jacobian and its transpose. A use of iterative methods and a choice of suitable preconditioner to solve reduced Newton systems arising in optimization with IPMs will be discussed. A new fast preconditioner will be presented. Its numerical properties will be analysed and its use will be illustrated by computational results obtained for a collection of small to medium scale optimization problems (with no more than one million variables and with matrices limited to at most 10 million of nonzero elements).

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